# ===========================================================================
#     http://www.gnu.org/software/autoconf-archive/ax_cxx_const_cast.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CXX_CONST_CAST
#
# DESCRIPTION
#
#   If the compiler supports const_cast<>, define HAVE_CONST_CAST.
#
# LICENSE
#
#   Copyright (c) 2008 Todd Veldhuizen
#   Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved. This file is offered as-is, without any
#   warranty.

#serial 6

AU_ALIAS([AC_CXX_CONST_CAST], [AX_CXX_CONST_CAST])
AC_DEFUN([AX_CXX_CONST_CAST],
[AC_CACHE_CHECK(whether the compiler supports const_cast<>,
ax_cv_cxx_const_cast,
[AC_LANG_PUSH([C++])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[int x = 0;const int& y = x;int& z = const_cast<int&>(y);return z;]])],
 [ax_cv_cxx_const_cast=yes], [ax_cv_cxx_const_cast=no])
 AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_const_cast" = yes; then
  AC_DEFINE([HAVE_CONST_CAST],[1],[define if the compiler supports const_cast<>])
fi
])
